ABAP Select data from SAP table WRF_DISCONT_HDR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WRF_DISCONT_HDR table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to WRF_DISCONT_HDR. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the WRF_DISCONT_HDR table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_WRF_DISCONT_HDR TYPE STANDARD TABLE OF WRF_DISCONT_HDR,
      WA_WRF_DISCONT_HDR TYPE WRF_DISCONT_HDR,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <WRF_DISCONT_HDR> TYPE WRF_DISCONT_HDR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WRF_DISCONT_HDR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WRF_DISCONT_HDR
  INTO TABLE IT_WRF_DISCONT_HDR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WRF_DISCONT_HDR
*  INTO TABLE @DATA(IT_WRF_DISCONT_HDR2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_WRF_DISCONT_HDR INDEX 1 INTO DATA(WA_WRF_DISCONT_HDR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WRF_DISCONT_HDR ASSIGNING <WRF_DISCONT_HDR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WRF_DISCONT_HDR>-MANDT = 1.
<WRF_DISCONT_HDR>-DISNR = 1.
<WRF_DISCONT_HDR>-DISNAM = 1.
<WRF_DISCONT_HDR>-CREDAT = 1.
<WRF_DISCONT_HDR>-CRETIM = 1.

ENDLOOP.

LOOP AT IT_WRF_DISCONT_HDR INTO WA_WRF_DISCONT_HDR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WRF_DISCONT_HDR-CRENAM, sy-vline,
  WA_WRF_DISCONT_HDR-UPDDAT, sy-vline,
  WA_WRF_DISCONT_HDR-UPDTIM, sy-vline,
  WA_WRF_DISCONT_HDR-UPDNAM, sy-vline,
  WA_WRF_DISCONT_HDR-DISSTA, sy-vline,
  WA_WRF_DISCONT_HDR-KZFACT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WRF_DISCONT_HDR you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_WRF_DISCONT_HDR TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_WRF_DISCONT_HDR INTO WA_WRF_DISCONT_HDR.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field DISNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WRF_DISCONT_HDR-DISNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WRF_DISCONT_HDR-DISNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WRF_DISCONT_HDR_STR, 
MANDT TYPE STRING,
DISNR TYPE STRING,
DISNAM TYPE STRING,
CREDAT TYPE STRING,
CRETIM TYPE STRING,
CRENAM TYPE STRING,
UPDDAT TYPE STRING,
UPDTIM TYPE STRING,
UPDNAM TYPE STRING,
DISSTA TYPE STRING,
KZFACT TYPE STRING,
LVORM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WRF_DISCONT_HDR_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_WRF_DISCONT_HDR_STR-MANDT sy-vline 
WA_WRF_DISCONT_HDR_STR-DISNR sy-vline 
WA_WRF_DISCONT_HDR_STR-DISNAM sy-vline 
WA_WRF_DISCONT_HDR_STR-CREDAT sy-vline 
WA_WRF_DISCONT_HDR_STR-CRETIM sy-vline 
WA_WRF_DISCONT_HDR_STR-CRENAM sy-vline 
WA_WRF_DISCONT_HDR_STR-UPDDAT sy-vline 
WA_WRF_DISCONT_HDR_STR-UPDTIM sy-vline 
WA_WRF_DISCONT_HDR_STR-UPDNAM sy-vline 
WA_WRF_DISCONT_HDR_STR-DISSTA sy-vline 
WA_WRF_DISCONT_HDR_STR-KZFACT sy-vline 
WA_WRF_DISCONT_HDR_STR-LVORM sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.